.nav{
    position: sticky;
    top: 75px;
    left: 0;
    margin: 0 auto;
    min-width: 1306px;
    width: 100%;
    height: 45px;
    background: #202020;
    z-index: 10;
}

ul{
    list-style: none;    
}

 .nav ul li{
    float: left;
    padding: 0;
    box-sizing: border-box;
    position: relative;
    width: 122px;
    text-align: center;
    margin: 0 20px;
    line-height: 45px;
    height: 45px;
    color: #fff;
    font-size: 14px;
 }
 .nav ul li:hover{
     display: block;
     color: orange;
     cursor: pointer;
     font-weight: 600;
 }
 #search{
    width: 230px;
    height: 38px;
    overflow: hidden;
    position: relative;
    margin-top: 10px;
 }
 .sousuo{
    position: absolute;
    right: 0;
    top: 0;
    width: 45px;
    height: 30px;
    cursor: pointer;
    padding: 0px;
    border: 0px;
    background: url(../img/ico-menu.png) no-repeat;
    background-position: 8px -353px;
    background-color: #fa4f17;
 }
.select::-webkit-input-placeholder{
    color:#ccc;
}
.select{
    background-color: #202020;
    padding: 2px 6px 2px 6px;
    border: 1px solid #777;
    border-right: 0px;
    font-size: 14px;
    width: 190px;
    height: 30px;
    color: #fff;
    vertical-align: middle;
}
.hidden1,.hidden2,.hidden3{
    display: none;
    position: absolute;
    top: 45px;
    width: 122px;
    height: 120px;
    background-color: #181A20;
    opacity: 0.8;
}
.nav ul li:nth-child(2):hover .hidden1{
    display: block;
}
.nav ul li:nth-child(3):hover .hidden2{
    display: block;
}
.nav ul li:nth-child(4):hover .hidden3{
    display: block;
}
.swiper{
    cursor: pointer;
    z-index: -1;
}
.placeholder{
    height: 75px;
}
.chat{
    text-align: center;
    width: 70px;
    height: 96px;
    position: fixed;
    top: 50%;
    right: 5px;
    z-index: 10;
    margin-top: -48px;
    background-color: #FFFFFF;
    border: 1px solid #ccc;
    border-radius:8px;
    font-size: 12px;
}
.chat div{
    color: #ccc;
    width: 52px;
    height: 50px;
    background: url(../img/spr-service.png) no-repeat;
    background-position: 10px 5px;
    cursor: pointer;
}
.chat:hover{
    background-color: #181A20;
    color: #fff;
}
.chat:hover .chat>div{
    background-position: -35px 5px;
}
